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How to: Modify key fob with switch 

 

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 Post subject: How to: Modify key fob with switch
Posted: Wed Apr 22, 2020 8:40 pm 
Getting Side Ways
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Age: 35

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Ride: BA MKII XR6

Location: Waikato
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So to give some background, I was sick of accidentally popping the boot and tripping the panic alarm just by bending over with my keys in my pocket, so I decided to add a switch so I can disable the key fob easily. This thread should show you how I did it.

*Note - I used a cheap aftermarket key fob, as I didn't want to destroy a genuine one if it went wrong. This means I know it fits in the aftermarket ones, but with the difference in battery holders between the two, I can't guarantee success with a genuine one. Here is the difference between the internals:

Genuine:

Attachment:
Genuine.jpg
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Aftermarket:

Attachment:
Aftermarket.jpg
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Tools needed:
Soldering iron, wire cutters / strippers, drill / dremel, small hobby files (optional), X-acto knife (optional), something to pry open the key fob.

Parts:
Key fob that you don't mind damaging, new battery holder, switch, some wires.

Attachment:
Parts.jpg
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Firstly I opened up the fob, removed the battery, and desoldered the battery holder from the circuit board:

Attachment:
Battery_Removed.jpg
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Then I took the back part of the case, worked out where the battery holder would fit best:

Attachment:
Cell_Fitment.jpg
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Then marked and drilled a hole for the switch:

Attachment:
Hole.jpg
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The hole can then be shaped with a dremel stone, small file, or even a sharp knife. I used a combination of all three, but whatever floats your goat.

After I soldered some wires to the switch:

Attachment:
Switch_Soldered.jpg
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I then test-fitted the switch to make sure it would work and had enough room to slide on and off:

Attachment:
Switch_Test_Fit.jpg
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Once I was happy with that, I glued it in place with some epoxy resin and soldered the wires to the battery holder:

Attachment:
Cell_Attached.jpg
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Once that was in place, I made up some more resin and affixed that too. I then trimmed the wires and soldered them to the board where the original battery holder was located:

Attachment:
Board_Soldered.jpg
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Then it was simply a case of fitting the battery into the holder, and reassembling the key fob. If you did everything correctly then Robert should in theory be your Mother's Brother.

*Note: I did have to grind down part of the new battery holder as the metal tab for the positive terminal was sticking up a bit far and would come in contact with the negative on the board, shorting it out. Easy fix though with a grinding stone on the dremel.
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 Post subject: Re: How to: Modify key fob with switch
Posted: Wed Apr 22, 2020 8:41 pm 
Getting Side Ways
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Location: Waikato
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Finished product is working perfectly and I no longer need to worry about scaring myself half to death by tripping the panic alarm while I'm leaning inside the engine bay :mrgreen:

Attachment:
Complete.jpg
Complete.jpg [ 126.09 KiB | Viewed 46 times ]
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 Post subject: Re: How to: Modify key fob with switch
Posted: Wed Apr 22, 2020 9:50 pm 
Fordmods Junkie
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well done! :D




only one part you forgot ........ sorry


at the worst case you will get some dirt/dust/moisture in the opening :mrgreen:
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 Post subject: Re: How to: Modify key fob with switch
Posted: Wed Apr 22, 2020 9:52 pm 
Getting Side Ways
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Age: 35

Posts: 411

Joined: 8th Jul 2009

Gallery: 2 images

Ride: BA MKII XR6

Location: Waikato
New Zealand

Mad2 wrote:
well done! :D




only one part you forgot ........ sorry


at the worst case you will get some dirt/dust/moisture in the opening :mrgreen:


It can't go past the switch - I sealed it with resin on the inside, that's how I glued the switch in place. Yeah some dust could get into the switch, oh well :lol: I could probably make a tiny rubber boot for it but I'm not that fussed :P
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 Post subject: Re: How to: Modify key fob with switch
Posted: Wed Apr 22, 2020 10:56 pm 
Fordmods Junkie
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Posts: 3511

Joined: 22nd Jan 2009

Ride: '03 BA Wagooon & EB Wagooons

Location: Geeelong
VIC, Australia

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